PAMAM树形分子对铝酸钠溶液种分过程的影响.pdfVIP

第39卷第2期 中南大学学报(自然科学版) 、，0I_39 NO．2 2008年4月 J．Cent．South Univ．(Science and Technology) Apr．2008 PAMAM树形分子对铝酸钠溶液种分过程的影响 黄 坚，陈胜福，李建文 (中南大学 化学化工学院，湖南 长沙，410083) 摘 要：采用发散法以乙二胺、丙烯酸甲酯为原料合成一0．5^4．5代聚酰胺．胺(PAMAM)树形分子，通过红外光谱表 征其分子结构。先将铝酸钠溶液加入反应釜中，再将PAMAM稀释后与晶种一起加入反应釜中进行种分实验，并 与无PAMAM添加剂进行对比。研究结果表明：PAMAM对氢氧化铝具有很好的吸附性能，以—COOCH3为端基的 树形分子比以—NH2为端基的树形分子更能强化铝酸钠溶液的分解过程和提高铝酸钠的分解率，半代PAMAM随 着代数的增加，在2．5代(含2．5代)之前强化效果增强，在2．5代之后强化效果减弱，2．5代PAMAM的加入与无PAMAM 添加剂相比其种分分解率提高l1．1％，粒径大于45 pm的粒子体积分数增}Jl3．45％；随着PAMAM用量的增加。铝 酸钠的分解率提高。 关键词：聚酰胺．胺0AMAM)：铝酸钠溶液；．添加剂：种分；氢氧化铝 中圈分类号：TF821 文献标识码：A 文章编号：1672．7207(2008)02-0290-05 Influence of PAMAM dendrimers on seed prect。pitation in sodium aluminate solution HUANG Jian，CHEN Sheng—fu，LI Jian—wen (School ofChemistry and Chemical Engineering，Central South University，Changsha 410083，China) Abstract：Generations-0．5-4．5G(G is generation)of poly(amid amine)(PAMAM)dendrimer were synthesized using ethylenediamine and methyl acrylate as raw materials by divergent method．Their structures were characterized by infrared spectra．After caustic aluminate solution was added to the stainless reactor,the PAMAM Was diluted and the seeds were added to the reactor．The results show that PAMAM has good adsorptive force in the surface ofalumininm trihydroxide seeds，and PAMAM dendrimer containing--COOCH3 terminal groups is be~er than that containing— NH2 terminal groups as additives which Can enhance the seed precipitation speed and precipRation ratio．The enhancement ofPAMAM ofhalf-generation increases with the build-up ofPAMAM generation before 2．5G (include 3．5G)